The figures came from a Freedom of Information request by The Sun on Sunday.

But the clinic, which is the only one in the country treating under-18s with gender identity disorders, told The Sun on Sunday it expects referrals for the whole financial year to “be in the region of 1,800”.

The Trust, which also has clinics in Leeds, Brighton and Exeter, offers under-18s and their families counselling and, in some instances, hormone blocking treatments that postpone puberty.

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Our findings come as new official guidelines have advised doctors to no longer refer to pregnant women as “expectant mothers” in order to make the NHS more inclusive.

Bernard Reed, of the Gender Identity Research and Education Society, said: “The growth is likely to continue.

“We welcome the extra resources that NHS has given for the provision of care for this population, but it is not enough to cater for the even greater numbers who are likely to come forward in the near future. The amount must continue to grow with the increasing number coming forward.”

Dr Bernadette Wren from the Tavistock clinic added: “Against current census data, one in 10,000 young people, are referred to our highly specialised service, and of those, the majority do not continue on to take up physical treatment through our service.

“There is no single explanation for the previous increase in referral figures, but we do know in recent years there has been significant progress towards the acceptance and recognition of transgender and gender diverse people in our society.

“There is also greater knowledge about specialist gender clinics and the pathways into them, and an increased awareness of the possibilities around physical treatments for young adolescents.”